react-vendoring

Use this skill for changes touching vendored React, react-server-dom-webpack/* , or react-server layer boundaries. React is NOT resolved from node_modules for App Router. It's vendored into packages/next/src/compiled/ during pnpm build (task: copy_vendor_react() in taskfile.js ). Pages Router resolves React from node_modules normally. Only entry-base.ts is compiled in rspack's (react-server) layer. ALL imports from react-server-dom-webpack/* (Flight server/static APIs) must go through entry-base.ts . Other files like stream-ops.node.ts or app-render.tsx must access Flight APIs via the ComponentMod parameter (which is the entry-base.ts module exposed through the app-page.ts build template). Direct imports from react-server-dom-webpack/server.node or react-server-dom-webpack/static in files outside entry-base.ts will fail at runtime with "The react-server condition must be enabled".